Enter seconds gained or lost per day, answer a few situation questions, and get likely causes plus safe home checks before service.
Home checks can narrow possibilities. They cannot replace timing-machine diagnosis or proper service.
Why is my watch running fast?Magnetism is a classic cause. Regulation drift, positional effects and service condition also matter.
Why is my watch running slow?Low amplitude, dried oil, low power, positional variation or service needs are common factors.
How many seconds per day is acceptable?It depends on the movement standard. Many mechanical watches are judged in roughly several seconds/day ranges, while COSC is tighter.
Can I fix it at home?You can test and demagnetize via a professional. Opening and regulating yourself is usually a bad idea.